Threading die



W. G. FURLONG ET AL.

THREADING DIE Filed Decfl'z, 192e ,s sheets-sheet, 1

MII. |ml\l www;

Oct. 22, 1929- w. G. FURLONG ET Al.

THREADING DIE 3 Sheetss-SheelI 3 Filed D60. 17. 1926 Patented Get. 22, 1929 UNITED STATES PATENT OFFICE WALTER G. FURLONG AND' KENNEDY H. CRUMRINE, OF CLEVELAND, OHIO, ASSIGNORS TO THE NATIONAL. ACME COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO THREADING DIE Application led December 17, 1926.

This invention relates to automatic threading dies, the object thereot being to provide an improved die of simple construction by means or' which the chasers can be brought up closer to the shoulder ofthe .work and qu'ckly released, the present die beingan 1mprovement upon that shown and described 1n Patent No. 1,474,179 dated November 13, 19:25. and owned by rlhe National Acme Company, the assignee oi' the present improvement.

rlhe present improved die very much simpliiies the die shown and described lnhthe patent referred to in that 1t entirely eliminates a number oi parts necessary 1n that d'e including the ring 4:1 of that patent. In other words,"instead of the two rings and All. ot that patent but one is necessary 1n the pre-cnt die and in the present improvement the operating lever or handle is connected directly with the die body instead of to the ring ll as in the prior patent, so that the lever operates directly on the die body 1ns'oad of in a ring carried on the shank of the die body. 'I' his change of construction, aside `"from eliminating certain parts, also permits the adjusting ring to be carried ivithn'the cap or housing instead of in the rear thereoi` in said patent, which thus p rnrts the adjusting screws to be located in the heavy i or back wall of the cap shell or housing, instead of, as in the patent, ic thin portion of such cap. In the presimprcvhment the construction is such that the instant the die body is drawn for-V ward 'to a position to permit the dies or chas'- ers to open lreely, the die cap or housing is, simultaneously with this opening movement ot the dies or chasers, forced rearwardly, thus making' the opening o-r closing of the dies exceptionally quick or rapid. Another ot the improved 'features of the present die is the cofiperating tapered or beveled portions or the jforward end ot the body shank and the openin or here oft' the body whereby the packi'ig ollv the chips is prevented so as to elimiiiate any interi'ference with the proper free end motion of the die body relative 'to the shank, whereas inthe patent aforesaid Serial No. 155,374.

the shank of the body is telescoped on to the spindle.

In the patent aforesaid` the die body is pro-vided with an integral shank overlapping the forward end ot the spindle. In the present improved di'ethe body and its shank are separable, the latter extending into the body and being resiliently connected therewith, thereby to permit the body to have an endwise shiftable movement relative to its shank, which construction eliminates certain parts necessary in the patented die, while at the same time it prevents the packing of the chips thus permitting` the thorough oil washing of the body.

Other objects of the invention will appear in the following description thereof.

In the drawings accompanying and forming a part of this specification, Fig. l is a front end view of this improved die with the chasers in their working position. Fig. Q is a side partiy longitudinal sectional view of this improved die also illustratingl the chasers in their closed position, the dotted lines illustrating the movement of the handle or lever when the chasers are opened. Fig. 3 is a longitudinal sectional View of this improved die, showing the chasers in position in readiness tobe released. Fig. et is a similar view to that shown in F ig. 3 with the chasers in their l'ully opened position and the die cap pushed back. Fig. 5 is a cross sectional view through a part of the die illustrating a portion of the adjustable ring and the means for adjusting it and thereby the chasers. Fig. 6 is a perspective view of the die body. ig. 7 is a perspective view of the die body shank. Fig. 8 is a perspective view oit the retaining ring for securing the die shank to the body. Fig. 9 is a perspective'view ot the adjusting ring which is located within the shell or housing. Fig. 10 is a perspective view ot the die cap or shell or housing. Fig. ll is a perspective view of the lever tulcrum bracket. Fig. 12 is a perspective view ot the lever or handle for closing the chasers. Fig. i3 is a perspective view of one of the chasers and its fastening screw. Fig. la is a perspective view of one of the Chaser blocks or plates and the spring for opening the chaser.

sition to' be"'released and Fig.'17 is al similar view illustrating the position of the diebody and its lcap or `housing when'thefchasers have been fullyf released.

Similar characters of reference in the drawings designate corresponding parts in'the several views.

Before explaining in 'detail the present improvement and mode of operation thereof, weVdesirel to:V have it iinderstood that the invention is not limited to the details of construction and arrangement of paits which are illustrated 4inthe ia'c2companying drawings, since" vthe 'invention `1is :capablev of other embodiments,"and tlratl'thephraseology which wel employ is Lfor 'then purpose of description and lnot of limitation.

lThis' improved threading tool `oridie comprises a rdie tcap shell yorf housing' 1 having suitable eentrallboresfor; receiving vthe die body 2 andthe 'die 'shank "3. j This 'die "body 2 is provided iii the rea1tliereofwith a counter-boredv 'opening' for receiving i the projecting or spigot end 4 of the die shank 3, andY this projectingen'dl of `thed'ie shank lis interiorly beveled as 'at'5,and the counterbore or opening of the 'body 'is also beveled as at 6, and these cooj'oerating beveled portions prevent the chips' from packing between the die `a`plurality of chasei receiving slots or recesses shown'herein as' four in number for positioningfand guidingl the threadii'lg`-- ldies or chasers 7 and their plates or blocks 8. Each of these `recesses is of T-shaped form, the forward `part thereof 9 receiving the chasers and the rear part thereof 10 receiving the chaser blocks or plates 8,to whichl the chasers are secured by suitable screws 11.v 'Each of the Chaser blocks or plates 8 is j arovidedwith aprojectingpin 12 extending `into itschaser and intoa slotor opening 13 in'the wall of theV die body for properly positioning and guidingl the Chaser,andbetween one end of eachpin 12D and the bottom wall'of eachslot 13 is located aspringlel e'llec'tive to open or release the 'chaser at Vthe proper time. vEach of the chasers is provided with what is usual ly designated as a land surface 15', curved circumferentially of the die but straight in the direction of the depth of the die or Chaser for cooperation with the cam lformed stations or portions 16 onthe'die shell, whereby on the relative rotation of the body and die shell the chasers are vadjusted to make the proper cut. In the rear of this land surface the j ring'20. secured to the rear of the die body by suitable screws. The recesses 18 are of suclr'depth relative to the driving lugs 19 as to form a clearance space 21 between the driving lugs and the retaining' ring 2O when the die 5is in lits normal assembled condition.

"Ilhedrivinglugs19 are providec with openings1`22 for the reception'of springs 23, the opposite endslof which engage the retaining ring 20. "Thesesprings 23 maintain the die b`ody'2 lin lined 'end relation relatively to the drivinglugs19, That is to say, they hold thedriving lugs in engagement with the front walls' of the recesses 18, see Fig. 15, while permitting forward niovement of the die bodyv relatively totheso driving lugs 19 and its'shank owing to the clearance space 21, thereby to' properly 'position the threading dieserl vcl'ia'sers 7 for opening movement to release the work.

Theldie body 2 is provided with a slot 24 for 'receiving the end of a lever 25 shown in thepresent instance 'as a handle lever, by meansfofwhich, in the form of die shown, the'chasersare reset. The die cap or housing 1 is provided with a fulcrum bracket 26, secured thereto by suitable screws 27; and this bracket 26 is provided with a pin 28 for properly supporting the lever 25. Wh en this lever 25 is pushed forward by hand or by striking a stop connected to the machine, the body 'carrying the chasers will be returned within this cap or housing and the chasers therebyv closed, this being accomplished on the return stroke of the spindle or turret slide carrying'the threading die.

In the present improvement it will be observed that this lever projects directly into the die body and it is not therefore connected with'a ring mounted on the body shank as in the patent hereinbefore referred to.

In order properly to adjust the threading dies or chasers a float or adjusting ring` 29 is provided, this ring having fixed guide pin 30 in position to project 'through an opening 31 in the retaining ring and into an opening in the rear wall of the die body. This adj ustY- ing ring 29 is held against endwise movement in the die `cap by a shoulder screw 32 projecting through a shouldered arcuate slot 33 formed in the adjusting ring, This arcuate slot permits rotary or circumferential movement of the adjusting ring and the die body 2, since the two are shiftably connected tolll) lla

gethe'r by the pin 3() and this circumferential movement is obtained by a pair of adjusting screws 34 carried in suitable threaded openings in the die cap. These adjusting screws engage lugs integrally secured to the rear wall of the adjusting ring and these lugs project into arcuate recesses 36 located in the rear wall of the die cap in position to be engaged by the ends of the adjustingl screws By adjusting one screw 34 right hand or inward to push against its lug 35 and the other screw 34 outward or left hand from its cooperating lug 35, the adjustable ring 29 and the die body 2, owing to the connecting pin 30, will be rotated relatively to the cap or housing. This rotary movement of the die body causes the threading dies to move either toward the ccnter line of the work spindle or outward or from the center line of such work spindle according to the adjustment desired, owing to the fou-r cam faces or stations '16 hereinbefore referred to on the die cap, see Fig. 10, which engage the land surfaces 15 of the chasers i', there being one cam face or station 16 on the die cap for each chaser. By this means the threading dies or chasers 7 are adjusted for the proper thread pitch and the proper diameter of the work or part to be threaded. The radial adjustment of the threading dies is -made or controlled by a suitable fractional graduation 37 located on the adjusting` ring 29, the die cap having a bevel face opening 38 therefor. The beveled portion of this opening 38 is provided with an index line 39 and the adjusting ring 29 is graduated on its periphery for a length equal to the maximum radial movement required foil a full range of adjustment of the threading dies v7 in either direction. The index line on the die cap and the graduations or divisions on the adjustable ring permit the proper adjustment of the threading dies and control the same.

ln practice the threading die is mounted on a spindle or turret slide of a machine used for threading and the threading die is sta on to its work on the forward movement of this spindle or turret slide. After the threading die is started on to the work, the revolving spindle carrying the work automatically pulls the threading die and the machine spindle or turret slide forward equal to the length of,l

the thread desired on the work less the travel required of the threading die for positioning to release the work. rlns forward travel of' the die and its turret slide continues until the,

dle which end travel is sufficient to close the clearance space 21 and which space is equal to the land surface 15 on the top of the threading dies or chasers. This' forward travel of the die body 2 after the machine spindle or turret slide is stopped by means of the stop provided on the machine for that purpose, permits the threading dies or chasers to run close up to the shoulder of the work that has been threaded andalso positions the threading dies or chasers in readiness to release the work, see Fig. 3. By bringing the juncture point of the land surface of the chasers and the inclined cam surface thereof in juxtaposition to the forward inner edge of the cap or housing, see Fig. 3, the chaser springs will move the chasers outwardly to open them at which time the inclined cam surfaces of the chasers will force or push back the cap or housing, see Fig. 4, thereby permitting the chasers to be fully opened by their springs .lll cooperating with the pins 12. On this open ing movement of the chasers the die body 2 is, as just stated, forced rearwardly or away from the shoulder on the work by the cam surfaces 17. Fig. 15 shows the clearancel space or gap 21 before the die body has been pulled forward. Fig. 16 shows the clearance or gap 21"L between the die body 2 and the driving lugs 19 when the threading dies or chasers are in position in readiness to release the work, while Fig. 17 shows the clearance space or gap 21 when the die body again assumes its original position in relation to its die shank 3 and its lugs 19.

When the `die carrying spindley or turret slide is ready for its next forward movement or threading operation, the threading dies are closed by means of the lever 25 by shifting this lever from its dotted line position into its full line position.

When it 'is desired to use the die with a rev volving spindle, the cap is provided with a grooved collar at the rear end thereof for shifting the cap or housing to close the chasers, as shown at 26 6) of the said Patent No. 1,474,179.

From the foregoing it will be observed that the die comprises a comparatively few number of parts and is extremely simple in its construction and assemblage and consequently it may easily be taken apart and cleaned, this being accomplished by merely removing two screws holding the handled lever in place whereby the die body with its shank attached can be slipped out of the cap so that the cap and the die body may be thoroughly cleaned, this requiring but a few minutes. The parts can readily be reassembledA without interfering with the cutting size of the chasers since the adjusting screws need not be touched.

One of the principal advantages of this improved die is that the die body can be pulled. back away from the work at the instant of opening of the chasers, thus permitting' closeto-the-shoulder threading and accurate cut-' ting of short threads. The chasers can be adjusted to the proper size of work quickly by CIJ means of a screw driverwithout removin'gt'he die from its holder'sincelthev adjusting screws are located in the periphery ofthe calpv and-are easily accessible.

Furthermore theppresent construction en ables all parts of the die to bei properly har-dened and ground and permits the free-flow of oil through the body of the die and itsshank which is tubular, therebyto washawaynthe chips from the tool, the collecting of whichis prevented by the beveled? formed parts' ofthe die body and spigot end of the shank.

Vhen the body is pulled forward to permit the chasers `to be opened, the cap is prevented from forward movement therewith by'a pair of stops or lugs-40 carried by the shank 3 and engaged by the adjusting ringfcarried bythe cap, thus 4limiting the forward movement-of the cap and permitting the body -tobeV drawn forward the required distance to: release the chasers.

These stops 40 are shown formed'as part of the driving lugs 19, being located at the rear thereof, thus providing a v'stepped formation near the end of the shank.

It is to be understood that by describing yin detail herein any particular form, struc ture or arrangement, it` isnot'intendedto limit the invention beyond theterms -ofsthe several claims or the requirementsofftheprior art.

Having thus explained thenature of-our said invention and-describeda way ofvconstructing'and using the same, althoughy withoutattempting toset1forthall of the forms in which it maybe made, or all-ofthemodes of its use, weclaim:

1. A threading die comprising aca-p having a pair of arcuate recesses `in its .-'rear wallya die body within said capfandfprovided lwith shiftable chasers, an. adjusting member `'within said cap and having rearwardly proj e'cting' lugsl extending into said arcuate recesses and a forwardlyf projecting pineXtending into the body ofv the Iclie,and adjustingscrews projecting through the rear wallof the cap tofengagefsaid lugsfonadjustingythe chasers.

2. A threading die comprising-Ja' cap yhaving v'a pair of arcuate recesses Ain-its rear wall,-a diebodywithin said capiand provided with chasers a1idwitha pairef radiallylocatedrecesses in its rear avail, a shank `havin'gavpar of radially projecting lugstting the recesses of the die'bodyl and having a depthless than the depthf ofthe recesses of saidZ die body,a retainingring securedt -to the body, springs betweenL said retaining ring andthe shank lugs, an-ad justing ring fitting said-shank `and-located within the `cap and connected-thereto for circumferential movement, said ring-`having a pair of rearwardly extendinglugs'itting the arcuate recesses ofthe cap-and also l havingka-forwardly projecting pin eXtend' meegaat? ing throughvv the retainingiring and intothe body of the die, and a1.pair'ofadjusting screws projecting i through the rear i wallof thevcap toY engage thelugsl of the adjusting ring thereby' to vadjust the chasers.

`3. A threading diecomprisinga caphaving va pairof arcuate recesses in lits ,rear wall, a diebodywithinsaid cap ancLprovided with chasers a-nd with aipairof radially located l recesses in Iits rear Vwall, Sa shank having a pair" of radially projecting lugs tting the' recesses ofi the die body` and having a depthvless than" the depthi of the recesses of said diebody, aretainingring secured toV thebody, springs'betweensaid f,

retaining ring and"V the "shank lugs an adjusting ring .fitting said.l yslianl{.and i located within the cap fand connected 'thereto forcircumferential movement,-said ring having a pair of 4rearwardly extending lugs iitting` the arcuate recesses ofthecapsand also 'having a forwardly l projecting;y pin extending through vthe vretaining f ring and into the body ofthe die, and a pair of ,adjusting screwsfprojecting'throughtthe rear "wall of thefcap to' engagethelugs of theadjusting ring thereby toadj ust thechasers, said body having a beveled countenbore and said shank having a beveled forward end in; juxtaposition thereto.

4.-A threading die comprisingacaphaving a pairof arcuate recesses in' its rear wall, a die bodywithin said-cap and provided with chasers -and-with Iapair of radially located recesses in its rear Wall, a-shank having a pair yof radially projecting lugs fit-A ting-the recesses of the'die body andihaving' a depth less than the depthloftherecesses of said die body,-aretaining ring secured to the body, springs between said retain-ing ring and the shank lugs, an` adjusting. ring fitting said shank and locatedwi-thin thecap and connected thereto for circumferential movement, said ringhaving apair of rearwardly extending lugs'fitting the arcuate vrecesses of the cap and also having a forward ly-projecting pin extending through. the retaining ring and into the body of the die, a pair of adjusting screws projecting through the rearwalll of the cap to-engage the lugs of the adjusting ring thereby to adjust the chasers, and a lever `fulcrumed on the capv and projecting Vdirectly linto 'the die body for closing the die.

5. A threading die comprising a cap having a pair of-arcuate recesses in its rear wall, a die body within said cap and provided with chasersand with-a pairof radially located recesses inits rear wall, a shank having a pair of -radially projecting lugs litting the recesses of the die ybody and having a depth less than the depth ofthe recesses of said die body, a retaining ring secured to the body, springs between zsaid retaining' ring and the shanklugs, an adj usting ring fitting said shank and located within the cap and connected thereto for circumferential movement, said ring having a pair of rearwardly extending lugs fitting the arcuate recesses of the cap and also having a forwardly projecting pin extending through thc retaining ring and into the body of the die, a pair of adjusting screws projectingthrough the rear wall of the cap to engage the lugs of the adjusting ring thereby to adjust the chasers, said body having a beveled counter-bore and said shank having a beveled forward end in juxtaposition thereto, and a lever fulcrumed on the cap and projecting directly into the die body for closing the die.

6. A threading die comprising a cap, a die body therein corresponding substantially to the interior diameter of the cap and provided with shiftable chasers, a shank resili-` ently connected with the die body to permit the body to have endwise movement relatively to the shank, an operating lever fulcrumed to the cap and projecting directly into thef die body, an adjusting ring carried within the cap and having` connection with the die body to permit endwise movement thereof, and means carried by said cap for adjusting said ring and thereby the die body to adjustV the chasers.

7. A threading die comprising a cap, a die` body therein corresponding substantially to the interior diameter of the cap and provided faces corresponding to the number of chas-'- ers and each of said chasers having a land` surface and an inclined cam surface in the rear of said land surface.

8. A threading die comprising a cap, a die body therein provided with a plurality of shiftable chasers, a shank projecting directly into said body and resiliently connected therewith whereby the body has endwise movement relatively to said shank, said lcap having a plurality of arcuate recesses in its rear wall, an adjusting ring located within said cap and having rearwardly projecting lugs extending into said recesses and a forwardly projecting pin extending into the die body7 and means carried by the rear wall of the cap for engaging said lugs to adjust the chasers.

9. A threading die comprising a cap, a die body therein provided with a plurality of shiftable chasers, a shank projecting directly i into said body and resiliently connected therewith whereby the body has endwise movement relatively to saidv shank, said cap having a plurality of arcuate recesses in its rear wall, an adjusting ring located within said cap and having rearwardly projecting lugs extending into said recesses and a forwardly projecting pin extending into the die body, means carried by the rear wall of the cap for engaging said lugs to adjust the chasers, and a shiftable lever fulcrumed on the cap and projecting into the die body for closing the chas- AGI'S.

l0. A threading die comprising a cap, a die body shiftable endwise therein and provided with chasers, a die shank having driving means directly and resiliently connected with the body whereby the body has endwise movement relatively to the shank, and means rigid with the shank for engaging and limiting the forward movement of the cap during thel forward movement of thebody.

11. A threading die comprising a cap, a die bodytherein provided with a plurality of shiftable chasers, a shank projecting directly into said body and resiliently connected therewith whereby the body has endwise movement relatively to said shank, and means for preventing the forward movement of the cap during the forward movement of the body and comprising a stop rigid with the shank and engaging a part carried by the cap.

12.y Athreading die comprising a cap, a Chaser-carrying die body endwise shiftable inthe cap, a die shank projecting directly into thebody and having interlocking driving means at its front end within the body, said driving means comprising a radial lug and a radial recess, one carried by the shank and the other by the body, the lug havingy less depth than the depth of the recess.

iA threading die comprisinga cap, a chaser-carrying die body shiftable endwise therein and a die shank having interlocking driving means at its front end within the body and resiliently connected with the body inthe rear of said driving means, whereby the body has endwise movement relatively to the shank, said driving means comprising a radially projecting lug and a radial recess, one carried by the body and the other by the shank. j

14;. 'Axthreading die comprising a cap, a Chaser-carrying. die body shiftablel endwise therein and a die shank having driving means at' its front end within the body and resilient- .lug and a radial recess, one carriedl by the body'and the other by the shank, said recess having greater depth than the depth of the lug.

l5. A threading die comprising a cap, a Chasercarrying die body-shiftable endwise rear of said retaining ring, said cap encircling said shank and enclosing the body, driving lugs, retaining ring and adjusting ring'.

25. A threading die comprising a cap, a eliaser-carrying body shiftable endWise therein, a shank, said cap and shank having, one, a radial recess and, the other, a radial driving lng having a sliding fit in said recess and havinfr a depth less than that of the recess, a retaining ring secured to the rear of the body in the rear of said lug and through Which the shank projects, a spring between said lug and retaining ring, whereby the body and l5 shank are directlyT and resiliently connected to permit the body to have endwise moveinent only relatively to the shank, anda cliaser-adjusting ring on the shank in the rear of said retaining ring', said body and the 2O front end of the shank having co-operating beveled surfaces in juxtaposition.

Signed at Cleveland, Ohio, this 13th day of December, 1926.

VALTER Gr. FURLONG.

KENNEDY H. CRUMRINE.

Cil 

